67940144551 has 4 divisors (see below), whose sum is σ = 69776364712. Its totient is φ = 66103924392.

The previous prime is 67940144537. The next prime is 67940144563. The reversal of 67940144551 is 15544104976.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 67940144551 - 2⁷ = 67940144423 is a prime.

It is a super-2 number, since 2×67940144551² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67940144651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 918110025 + ... + 918110098.

It is an arithmetic number, because the mean of its divisors is an integer number (17444091178).

Almost surely, 2^67940144551 is an apocalyptic number.

67940144551 is a deficient number, since it is larger than the sum of its proper divisors (1836220161).

67940144551 is a wasteful number, since it uses less digits than its factorization.

67940144551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836220160.

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 67940144551 in words is "sixty-seven billion, nine hundred forty million, one hundred forty-four thousand, five hundred fifty-one".